If you want looks/design, can see you are willing to spend than why not.
Get Aego 3 either the soundbar version or get vendor to do wall mount for 2.1 speaker.
This set will cost $450 but only at Audio Basic Adelphi.
Why I disagree that you can use Y splitter from PC speaker out is very simple.
PC speaker out is for Stereo/Left channel signal.
To use a sub using this channel, if you have any 2.1 speaker remove both speakers.
The sub will play the source from the output but it will sound maffled.
As the output is Left/Right and there is no LFE in this signal.
Playback there is audible sound from the sub since it is handling Stereo/L/R signal.
Those sub for it to work properly is best to pair with a AV receiver as mentioned.
LFE is dedicated for low frequency like bass which PC soundcard does not have.
If anyone want to experiment remember bass is thump thump.
Not sound like hollow audio with thump thump so dedicated sub have to connect to
correct output for proper bass output.
Why I state this point again is I don't wish anyone to spend money than realize
it does not work as intended.
I been playing with audio for many years, my PC audio is Logitech Z407 with Creative Recon3D.
If I need more music power than I just stream to my Pioneer Home Theater 5.1 with Pioneer
Andrew Jones Atmos speakers.